this post was submitted on 03 Dec 2024
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Advent Of Code

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An unofficial home for the advent of code community on programming.dev!

Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

AoC 2024

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Day 3: Mull It Over

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[โ€“] [email protected] 1 points 2 weeks ago

Smalltalk

I wrote matchesActual cause all of smalltalk'sstupid matchesDo: or whatever don't give you the actual match with captures, only substrings (that wasted a good 40 minutes).

Also smalltalk really needs an index operator

day3p1: input
  | reg sum |
    reg := 'mul\((\d\d?\d?),(\d\d?\d?)\)' asRegex.
    sum := 0.
    
    reg matchesActual: input do: [ :m | " + sum at end cause operator precedence"
        sum := (m subexpression: 2) asInteger * (m subexpression: 3) asInteger + sum 
    ].
    
    ^ sum.
day3p2: input
  | reg sum do val |

    reg := 'do(\:?n''t)?\(\)|mul\((\d{1,3}),(\d{1,3})\)' asRegex.
    sum := 0.
    do := true.
    reg matchesActual: input do: [ :m |
        val := m subexpression: 1.
        (val at: 1) = $d ifTrue: [ do := (val size < 5) ]
        ifFalse: [ 
            do ifTrue: [ 
                sum := (m subexpression: 2) asInteger * (m subexpression: 3) asInteger + sum.
        ].  ].
    ].
    
    ^ sum.